Nothing to back this up except for what I see.
I personally think the outside posts before the turn allows a jockey more room to decide where he wants to position the horse. I've seen times where 2-3 horses were all at the front and sometimes different horses drop out of the duel. Maybe the horse wasn't great to begin with though. So my thought it, the rail is great when a clear lead can be had so you get the benefit of the rail and no stressful horses on the outside.
Just something I've observed, I've seen the situation never happens the same everytime.
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